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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092621dea7810b71f7cebd9cc917c5c9c511c444b08ecd4d21ec8e5ffff9de17' 
  AND token = 'Y8illPiTj4G38Hrgx9uMlI0WR5GTMzZJmPBy6X6hxdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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