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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f39c87eb979b087ecc50ae68a3d28ef0e8083a38c12e5a7a063e28613564e2' 
  AND token = 'YmVEr+uoBYkRf7hqXFx765MzMe28N5VwBncdXCts/gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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