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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdba131db41feb84f11aae359ab6dc409479443d0e4a39b42307ba2657c872e' 
  AND token = 'AB8Lg0ctaZoq637CZZUNFYP1bhtbh3YGZb7M3c58mvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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