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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454af7666da1f5d5cea19a72a1de2ddc13aac6e715f70a8d673f05582dc04a8e' 
  AND token = 'zNBi3l9na39D7EZi4Ubxx+hKYdwlqvPqCAta92xDndo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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