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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f891b50827867c8312bea7dfb5719f92ca3f2e9ed35f70620a53949f5835b26' 
  AND token = 'MjFWw5+SPW/O7LMakOgvOouczlnLO6o/QVVfKA7vMko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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