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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e18a034edecab6d53f527ce20941a4e3ee7239dd50c306b2da34258f21bc5b' 
  AND token = 'BH0oE3qtQD3F//ZX5NJfqoEGJ9CVrbDBRis2VIgUr58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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