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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d71369dfbd01de087e110c658992741b7066a15ff37e674b12cdb3e090b30a8' 
  AND token = 'g6biENCV7q1hDqgSrRYcgthoangiO8TU/TkMSs5x6sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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