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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b2779d9136d3efe143ae4c8f122449fb88a5409dd55a0c5a5ba433c2919120' 
  AND token = 'nFyk+grSCxeicPdM6LNMXdVSYgg14Z6ka5qoUdncLIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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