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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ff71cf26433587d5d1f006ecbc4ae4f5f41c1ab0bcbe8f9350acc1517df3aa' 
  AND token = 'kBB8Ib/O9vW1rycNX2HAYUZg/H5UkG6iGEW2zkbclts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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