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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee61aca3984b340478a130c2c8fe3f289c890a779e34dca929ab6ba168010174' 
  AND token = 'BUap+3LYe9ghzFtcTXQnuQdwibiklK7zWPClLwISeKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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