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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974fb1390d927d520115b3a3057cd7372838c46b8cd6d689f60f81ab48c62d5a' 
  AND token = 'sgpnopa2cB5gMoXxlnCx2eORiRxT/v/pJC27+pgvyNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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