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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89dc1f019f5b31619c02119701dae030304ce667b90be1aaa3dfb712b80829e' 
  AND token = 'eihTT7muA69mubmPzAR6bBd7eBaqJuD3KjYnmcF0gm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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