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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da819a713590fd2d58ea7480574bb5074c064707e0a1400bc2513afdcd152c1e' 
  AND token = 'WOsMVYTP76+ghIkJs9/E7Js8TAqjFeVPMWSPSqW7ZK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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