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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dad4fa082989156b72ca14c68b2a578a7dab34478760e70df56c04078a0ce6' 
  AND token = 'OYyTztivyV/HNCx/dvFOt2NqqfidJX72G46jH9Tu40o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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