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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf1127fdaf29b099d0e593ba2d47e011a0c381c775182bb1040060347b6bf4a' 
  AND token = 'g/j3yI8v2WkfdmjEzo33LQV33IGJHm2QQYUZ7lfTXoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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