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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6daf7181a7ab1b2ef52be9eee55c75c5d3e23d6b458a88708351a8ca3ed927c4' 
  AND token = 'imgdi/SGodl3L/fR8kDhaepj9ElkJg7InQA0bJsl+w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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