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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0a582cb54ddb4b438e914e4eb30a5a1d163a909ee65920c9f7984608088c37' 
  AND token = 'eMkUAdDHE+X+aWk11RgZtZdNVkRT8JlMIXuFF3DcKq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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