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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e2cb2b1ccc24d596815b124e8d2cbc916ac55920152a2b8efbf084f2076324' 
  AND token = 'J7ID6y/Pox1DOqFBbdIpl9FR1U/QqTEaBx6VjS5izh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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