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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2674007c48adde283eb3b1b7bad0f430bdc516c990c8f3f8e0808660dcdb4b4c' 
  AND token = 'vxRuX/Oyi634D86nmqdWdk5cCT8zpKE37ibvsGAqGZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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