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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17412e28991958b2286cd780c9288075a71f80bf47672ea1cabb491c4a28e7a' 
  AND token = '4bMdzpDn3kHC0a2vhJA3RPNja4qZbbsyd7ZZ3PpBUyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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