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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a618236c9889e08d900ff671cca572a01b773d4c490cbec22628fcc3cfac5194' 
  AND token = 'ffgQPbe6MV/4s4g4FF/pjeX0zycY4KKPFtG2r84ugyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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