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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eded6a5d3a3f3bf0b2db63b7a9a7ab06bfa9becd14cfd4d47756ce9e665680' 
  AND token = 'PUJu2H7dUjpTu6ujXi2hgwTFLaJGv7oCm1+mh+cFMC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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