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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c834f06924cfdb553f7c7d41407cddb41b7b3ff74fbdebf008484bb311f87074' 
  AND token = 'Nye2vZB832XxAhEe0Qau67QOmIFi6rSnoal7+gUd+xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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