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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528a690a35fd4ca28dde73544ad23bc96f9bedb41fbc7850f67003976cfb32a2' 
  AND token = 'g8dr9jlebMx2XBayg22PSW3kotNfFQWPQvZqyD1XDi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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