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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784c334e0603089fc58c68b0d119d4c1a78172c5d01be141ef0401c50f0ffa6d' 
  AND token = 'NGkc/n18rWnw80rJPt14WF8lulvwCK0uyMsyyl9ez2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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