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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2dcd0a55aa988804c245c62e3a472c934327858a09fc9fd253c275f93d6ae4' 
  AND token = 'D9l/QzEc3+HB1NSOWavvn8jQd07gka2/4+DhJie85I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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