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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccca24c2a59dc410a57a67a70340cf3a0afcc2e6388edc1da77a7dd3b56d3ff9' 
  AND token = 'e3he1F8LV87Cr+11zjj5BbP/TVyF6hMhGlnju+NwsRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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