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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2961636451ce6c4e5ef248bc43db50bc940f4ded2a7c5f140006f70b4d41d910' 
  AND token = 'al57ba/zRoNnqjGU65Qf1ziWGv12wPmqL1cN6T9xsGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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