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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9204a3751114a638a213c2aaff88f9ab25914c13eef492839eb7d6fdce42e89b' 
  AND token = '0PrC/6VCU6or3PEG2i9a4yzQXOPMXqna9zL/Fma8mR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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