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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be9a1efaad7f5ee2d3e2607e6f79e1e72fe6eb3fb3ff59b93dabd359107fbba' 
  AND token = '3+zp6e+PxF+cfUJJUUZoDaGayHJ2tdIPhN1XhlgKWbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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