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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac31e9d5065049db35d0695604e74a0c9fb405d80d22a1042b3c41964d44b556' 
  AND token = 'QcDOgkq4ly9NqpVrEeX5S8yvXT7zMRZ+Vhtn+DdTxVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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