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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5e0da88199750c9edd0e1ef209a36b3633b5cb863d5b2954ec543f5ca4a63a' 
  AND token = 'XDK3qcWSBafqn0x9bxas6e0S0+/czjNnqP94HBHfIzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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