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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb1f52e6af6665c2b57e65a2bf42fe8ca1098312038a6a2a4425d6170c5a7d9' 
  AND token = 'drH8/7OekV2i4AZtjOgm1n9j9FS8qApb3n21RuSLzBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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