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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b55d31faa1f97f8394a6894ea8053ebfbed7b73684ab678e9687b7f7016e05' 
  AND token = 'n0dkQ2O9c6bQhhbLEU4viAm9ox3800WJCPIVryoaWJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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