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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a32d7cd7febf8ce8199a040eb8db9e7a1e8d09e9f385460e75fbd2cf9b54a5' 
  AND token = 'E87AKpNCVl75dZ8MTjljJls7Tuk8Lix3V6Mlul8KcVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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