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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833be9b39abd88d23a7b3b898b56e1abd11f77c01f29d4ac1b066fbde95028e0' 
  AND token = '0a1cKEWKp+vvlcG1UgEbeFLV6QW8mvSUJinJvQSibd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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