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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb6c39f415e65903a4719c28cd8bf5ba57cb6e2861a7cbe74fad51dd9fe0b7b' 
  AND token = 'pHzCK+YwxLPmfBbToBQT0TpmDG48TdQ36LJYyfaA4wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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