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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a2b5e3feba441f4da5d19b6a03854d24d8507fcaf0298a8337373b3b810ab9' 
  AND token = 'mHvZE+XV4FrQEWYdi7oJNVW5RMJmwoi0VsAYdvndp8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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