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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1044da78b9b17ba911c0f2ceac8de119789dab013898cd8e0c9421c6b4873dc2' 
  AND token = 'Ttg1zyva73sj+Sv7JnAgJ4zSFFeXIbRuL3wUqyrCASA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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