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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acc42d7de25809165ce4080108c8a09b104dfcc485695c8af44c8d46383d7ed' 
  AND token = 'K5cLr6YKa1RtOcboQ+XXspe2et6tdXa8MoTYFCJ5kCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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