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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0202c841b0ed410c60152301a7c3bd34e6f2fa9d7d1dcdf2bc96fa7a4184b7' 
  AND token = 'qgjh5vLiUDrfWQSO91bQn3YyJR49QrqiaB1lfshCkjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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