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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f74475cdab19067e51ccbd22de05adb93d095c0122697d96026d5bd2ed25f1e' 
  AND token = '55HuSxW7vyKdojeBWg/AHeqbIF4z/ldApmK5pswRObI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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