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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67cc05224c6968d1fb0d37e0c870a4cb1c8d87589d6b74cf3d8c5df986568b0' 
  AND token = 'bpMtc8JmGNUYaGNsEtldE8Ag10kSpcB4NJPpDDuCeFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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