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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c82dd5a11e0d47919ddd0d99b5c6858086fc2e655efca5595e9dce4122adb73' 
  AND token = '8VUAt/+vDYywid02+orwqCejVnartQ734AE8LBVACHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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