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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7af617cb5e2b7857b5ac5e1af8c2cb6d6fd0a129beee5593ab34fdf4346e26' 
  AND token = 'OND1b1aTsemgBRCrJIIj4avU3tRJBrsJ4wg3QhKjLmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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