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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7468df20a136d1ae654d561a458faf0b1f26992baa73fa0793ee48cdac4dceea' 
  AND token = '6lVgCT5XVVR5nqNwBUy1J3l4w1njp7H1i1ekxrWOnzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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