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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e074c1801a5818a2ac6c69e97898493acd92c4f7f4b076aeedc8048c486f7455' 
  AND token = '+9RTIHswshe5pUKR77yqUqBLYx46HvoQ2NxvmKkkY5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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