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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4956a609854a169c1987f37184dba9d5fde3dca47e4b97415989edb1fcaf5177' 
  AND token = '7UPIW0D0J9CNa1gtx4mjs9gE31WpzjJuluSg46k8b/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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