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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec4d6da7ed2fa6e37f92b5ba8b176010d8c92a4e3cbfa8084ab4359850de804' 
  AND token = '7TTTe9HLI95rgSjFRxBAqkahvO04doqni3mNq5HIcIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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