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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ef152b7456c3e7873c567034ed48f60c1c5ebeb6caecfccba2ef298cc6a31b' 
  AND token = 'yMUwGyZ6faOMcPuahIV1zfvVmmKOkaqt2LbUTR2Ba5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}