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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c7e4c627000de5400fff26826887796e07d239fda649db3b7687b49ba88eed' 
  AND token = 'Gct/TLJY4znEN/RQcKMvnYtIP6IxQVjpRi2epu43kRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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