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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c329af41c2f4e4b1811fe4fefa25db38b3b74fed3cf19796df0aede5e40eac' 
  AND token = 'lA1/srtLjBhv0KxjohNh321i7yAzq5I72i6Z7Erb1Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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