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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa57b4c1c2befb03c3d258da025c30ff08ee4df81e587c813c7236cf40040482' 
  AND token = 'CvEexLvZU6iQ+bXdq7dlvVKvxfn2kFMV1Q4zqtpxaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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