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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e57ba8cf3586c123782569fab4c11d0b36bc9f08857473ccdd578aea675dfd' 
  AND token = '/4rfoowO6FCph54ux7Y0W6Ks9QrB86SjdKiznMjcJM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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