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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3210ef1ba6ac194732ba0b0e48d9240a82350059d4aba32daf9ec270d7ec8a2b' 
  AND token = 'HV5OtFoqsiHuKKmJbw4Kofi7E78sx9nHp3Me32xEaXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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